CN209559967U - A kind of current signal detecting device - Google Patents
A kind of current signal detecting device Download PDFInfo
- Publication number
- CN209559967U CN209559967U CN201822029973.4U CN201822029973U CN209559967U CN 209559967 U CN209559967 U CN 209559967U CN 201822029973 U CN201822029973 U CN 201822029973U CN 209559967 U CN209559967 U CN 209559967U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistance
- chip
- pin
- opa227
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003321 amplification Effects 0.000 claims abstract description 20
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 373
- 230000005611 electricity Effects 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 14
- 238000001228 spectrum Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical group [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 238000010422 painting Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Abstract
The utility model discloses a kind of current signal detecting device, which includes power amplification circuit, current sensor module, differential amplifier circuit, bandwidth-limited circuit, post amplifier circuit, emitter follower circuit and signal acquisition circuit.Input signal of the external cycles signal as whole system, the signal induces current signal through over-current sensor after power amplification circuit and enters differential amplifier circuit, the output end of the input termination difference amplifier of bandwidth-limited circuit, enter amplifier circuit through filtered signal and carries out certain amplification, the signal of the frequencies such as emitter follower output and input constant amplitude, signal acquisition circuit realize the acquisition and display to signal.The utility model is simple for structure, and circuit loss is low.The problems such as noise is big, drift is serious is overcome, simultaneously because the chip has low noise, wide bandwidth, high-precision characteristic, substantially increases the acquisition precision of signal and the stability of system.
Description
Technical field
The utility model relates to current signal detection devices more particularly to a kind of for detection cycle, the electricity of inductive signal
Flow signal supervisory instrument.
Background technique
Most of current signal monitoring device is not conformed to due to the selection to chip and to the design of analog circuit at present
Reason so that the signal supervisory instrument designed there are noises it is big, drift is serious and the distortion factor is high the disadvantages of, simultaneously because single
The timer internal and dominant frequency of piece machine are limited, slow to the acquisition speed of signal, error is big, resolution ratio is lower, therefore are unable to satisfy
The demand of precision, while when signal is sine wave or triangular wave, at this time by range that the frequency spectrum of signal is covered
Compare wide, therefore single-chip microcontroller can not accurately acquire it, it is therefore desirable to design a kind of current detection means to meet
Demand.
Utility model content
Goal of the invention: in view of the problems of the existing technology, the purpose of the utility model is to provide one kind can be improved letter
The current signal detecting device of number precision.
Technical solution: a kind of current signal detecting device, including power amplification circuit, current sensor module, difference are put
Big circuit, bandwidth-limited circuit, post amplifier circuit, emitter follower circuit and signal acquisition circuit；External cycles signal
As the input signal of whole system, which is passed by entering current sensor module after power amplification circuit through electric current
Sensor module induces current signal and enters differential amplifier circuit, is amplified and is filtered out accordingly in differential amplifier circuit
Enter bandwidth-limited circuit after partial noise, the amplitude of signal is judged after filtering out corresponding spectrum component, to single-chip microcontroller
The amplitude for the signal that can not accurately measure enters emitter follower circuit after amplifying, through entering after follower isolation effect
Single-chip microcontroller measures.
The power amplification circuit uses OPA548 chip, further includes resistance R11, resistance R12, resistance R13 ', feedback electricity
Hinder Rf, resistance R13, capacitor C12, capacitor C110, capacitor C130, capacitor C131 and row needle P11, signal input part IN, signal
Output end VOUT；The amplification factor of the power amplification circuit is one times；The one end the resistance R11 is connected with resistance R12, in addition
One end is connected with the VIN+ pin of chip OPA548；The one end resistance R12 is connected with resistance R11, other end and chip OPA548
The end input terminal IN be connected；The one end resistance R13 is connected to the ground, and other end is connected with the VIN- pin of chip OPA548；Resistance
The one end R13 ' is connected with the pin Ilim of chip OPA548, other end and capacitor C110, capacitor C130 and row's needle P11 phase
Even；The one end feedback resistance Rf is connected with the VIN- of resistance R13 and chip OPA548, the VOUT of other end and chip OPA548
And the end VO of chip OPA548 is connected；Capacitor C110, one end of capacitor C130 are connected with the Ilim pin of chip OPA548, separately
Outer one section is connected to the ground；Capacitor C12, the one end capacitor C131 are connected with the V+ pin of chip OPA548 and row needle P11, other end
It is connected to the ground.
The current sensor module is that coiling is made on manganese core magnet ring by enameled wire.
The differential amplifier circuit uses INA217 chip, further includes chip input signal pin P21, input signal pin
P22, row needle P23, output signal pin P24 and capacitor C220, capacitor C221, capacitor C230, capacitor C231, resistance R21, electricity
Hinder R22；Wherein the one end resistance R21 is connected with the VIN- pin of chip I NA217 and input signal pin P21, other end with
The VIN+ pin and input signal pin P22 of chip I NA217 is connected；The RG1 pin of the one end resistance R22 and chip I NA217
It is connected, other end is connected with the RG2 pin of chip I NA217；Capacitor C221, the one end capacitor C231 and chip I NA217 V-
Pin and P23 are connected, and other end is connected to the ground；Capacitor C220, the one end capacitor C230 and chip I NA217 V+ pin with
And row needle P23 is connected, other end is connected to the ground；The pin REF of chip I NA217 is connected to the ground, pin VOUT and output signal
Pin P24 is connected.
The bandwidth-limited circuit uses Butterworth configuration；The cutoff frequency of its high-pass filtering circuit is set as 40Hz,
The cutoff frequency of low-pass filter circuit is set as 4KHz, thus forms bandpass filter.The low-pass filter circuit includes signal
Input terminal P31, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, resistance R36, capacitor C31, capacitor C32,
Capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37, capacitor C38, capacitor C332, capacitor C333, capacitor C335, electricity
Hold C337, output signal terminal P32, row needle P34 and two OPA227 chips: the first OPA227 chip and the 2nd OPA227
Chip, wherein the one end resistance R31 is connected with input signal terminal P31, other end and resistance R32, resistance R33 and capacitor C31
It is connected, the one end resistance R32 is connected with resistance R31, capacitor C31, resistance R33, other end and capacitor C32 and resistance R34 phase
Even, the one end resistance R33 is connected with resistance R31, resistance R32 and capacitor C31, other end and capacitor C32 and the first OPA227
Chip pin-IN is connected；The one end capacitor C32 is connected with resistance R31, resistance R32, resistance R333, and other end is connected to the ground；
Capacitor C37, the one end capacitor C332 are connected with the V+ pin of the first OPA227 chip and row needle P34, and other end is connected to the ground；
Resistance R34 one end is connected with resistance R32, capacitor C32 and the first OPA227 chip pin output, other end and capacitor
C34, resistance R35, resistance R36 are connected；The one end capacitor C34 is connected with resistance R34, resistance R35 and resistance R36, other end with
Ground is connected；The one end resistance R35 is connected with capacitor C34, resistance R34, resistance R36, other end and capacitor C35 and second
OPA227 chip pin-IN is connected；The one end resistance R36 is connected with capacitor C34, capacitor R34, capacitor R35, other end and electricity
The output pin for holding C35, output signal terminal P32 and the 2nd OPA227 chip is connected；Capacitor C38 and the one end capacitor C333
It is connected with the 2nd OPA227 chip pin V+, row needle P34, the other end is connected to the ground；Capacitor C33, one end capacitor C335 and first
V+ pin, the row needle P34 of OPA227 chip are connected, and other end is connected to the ground；Capacitor C36, one end capacitor C337 and second
The V+ pin and row needle P34 of OPA227 chip are connected, and other end is connected to the ground；One end output signal terminal P32 and second
The output pin of OPA227 chip is connected, and is connected to other end；The one end input signal terminal P31 is connected with resistance R31, separately
Outer one end is connected to the ground；
The high-pass filtering circuit include input signal terminal P41, output signal terminal P43, capacitor C41, capacitor C42,
Capacitor C43, capacitor C49, capacitor C430, capacitor C411, capacitor C434, capacitor C44, capacitor C45, capacitor C46, capacitor C48, electricity
Hold C431, capacitor C47, capacitor C435, resistance R41, resistance R42, resistance R43, resistance R44, row needle P44 and two OPA227
Chip: the 3rd OPA227 chip and the 4th OPA227 chip, wherein the one end input signal terminal P41 is connected to the ground, other end
It is connected with capacitor C41；The one end capacitor C41 is connected with input signal terminal P41, other end and resistance R41, capacitor C42, capacitor
C43 is connected；The one end resistance R41 capacitor C41, capacitor C42, capacitor C43 are connected, and other end is connected to the ground；The one end capacitor C42 with
Capacitor C41, capacitor C43, resistance R41 are connected, and other end is connected with+IN the pin of the 3rd OPA227 chip and resistance R42；
The one end capacitor C43 is connected with capacitor C441, capacitor C2, resistance R41, other end and resistance R42 and the 3rd OPA227 chip
Output pin be connected；The one end resistance R42 is connected with+IN the pin of capacitor C42 and the 3rd OPA227 chip, other end
It is connected with the output pin of capacitor C43 and the 3rd OPA227 chip；Capacitor C49, the one end capacitor C430 and the 3rd OPA227
The V+ and row needle P44, capacitor C48, capacitor C431 pin of chip are connected, and other end is connected to the ground；3rd OPA227 chip
+ IN pin ground connection；Output pin and resistance R42 of the one end capacitor C44 with the 3rd OPA227 chip, capacitor C43 phase
Even, other end is connected with resistance R43, capacitor C45, capacitor C46；The one end resistance R43 and capacitor C44, capacitor C45, capacitor C46
It is connected, other end is connected to the ground；The one end capacitor C45 is connected with resistance R43, capacitor C44, capacitor C46, other end and the 4th
- IN the pin and resistance R44 of OPA227 chip are connected；The one end capacitor C46 and resistance R43, capacitor C44, capacitor C445 phase
Even, other end is connected with resistance R4；The one end resistance R44 and the-IN of capacitor C45, capacitor C46 and the 4th OPA227 chip draw
Foot is connected, and other end is connected with the output pin of the 4th OPA227 chip and output signal terminal P43；4th OPA227
Chip+IN pin ground connection；The one end output signal terminal P43 is connected with the output of resistance R44 and the 4th OPA227 chip, separately
Outer one end is connected to the ground；Capacitor C49, the V- pin of the one end capacitor C430 and the 3rd OPA227 chip and row needle P44, capacitor
C48, capacitor C431, the V- pin of the 4th OPA227 chip are connected, and other end is connected to the ground；Capacitor C48, the one end capacitor C431
With the V- pin phase of capacitor C49, capacitor C430, the V- pin of the 3rd OPA227 chip and row needle P44, the 4th OPA227 chip
Even, other end is connected to the ground；Capacitor C434, the one end capacitor C411 and the 3rd OPA227 chip V+ pin, capacitor C435, electricity
The V+ pin for holding C47, row needle P44 and the 4th OPA227 chip is connected, and is connected to other end；Capacitor C47, capacitor C435 mono-
End and capacitor C411, capacitor C434, the V+ pin of the 3rd OPA227 chip, the V+ pin of the 4th OPA227 chip, row needle P44
It is connected, other end is connected to the ground.
The post amplifier circuit includes input terminal P51, output terminal P52, resistance R51, resistance R52, resistance
R53, resistance R54, capacitor C51, capacitor C52, capacitor C53, capacitor C54, needle P53, the first OPA228 chip are arranged, wherein input terminal
Sub- one end P51 is connected with resistance R51, resistance R52, and other end is connected to the ground；The one end resistance R51 and input terminal P51 and
Resistance R52 is connected, and other end is connected to the ground；The one end resistance R52 is connected with resistance R51 and input terminal P51, other end
It is connected with-IN the pin of the first OPA228 chip and resistance R53；+ IN the pin of first OPA228 chip is grounded；Resistance R53
One end is connected with-IN the pin of resistance R52 and the first OPA228 chip, other end and the first OPA228 chip
Output pin and resistance R54 are connected；The output pin of the one end resistance R54 and resistance R53 and the first OPA228 chip
It is connected, other end is connected with output terminal P52；The one end output terminal P552 is connected with resistance R54, other end and ground phase
Even；Capacitor C51, the one end capacitor C52 are connected with the V- pin of the first OPA228 chip and row needle P53, other end and ground phase
Even；Capacitor C53, the one end capacitor C54 are connected with the pin V+ of the first chip OPA228 and row needle P53, other end and ground phase
Even.
The emitter follower circuit includes input terminal P61, output terminal P62, row needle P63, resistance R61, resistance
R64, capacitor C61, capacitor C62, capacitor C63, capacitor C64, the 2nd OPA228 chip；The wherein one end input terminal P61 and resistance
+ IN the pin of R61 and the 2nd OPA228 chip is connected, and the other end is connected to the ground；The one end resistance R61 and input terminal P61 with
And the 2nd OPA228 chip+IN pin be connected, other end is connected to the ground；- IN the pin and second of 2nd OPA228 chip
The output pin and resistance R664 of OPA228 chip are connected；- the IN of the one end resistance R64 and the 2nd OPA228 chip and
The connected other end of output pin is connected with output terminal P62；The one end output terminal P62 is connected with resistance R64, and in addition one
End is connected to the ground；Capacitor C61, the one end capacitor C62 and the V+ pin of the 2nd OPA228 chip and row needle P63 are connected, and in addition one
End is connected to the ground；Capacitor C63, the one end capacitor C64 and the V+ pin of chip OPA228 and row needle P3 are connected, other end and
Ground is connected.
The utility model has the advantages that compared with prior art, the utility model has following progress: 1, circuit design is simple, same to phase
Than for other chips, selected chip is with high voltage, high current, the high output voltage amplitude of oscillation and has lower
The characteristics such as circuit loss；Only it need to can meet functional requirement by the method for emitter following, it is at low cost.2, analog filtering algorithm
Design is simple, is easily achieved, using Butterworth configuration, since Butterworth filter in line style phase, attenuation slope and adds
Carrying three aspects of characteristic has balanced characteristic, therefore is more easily implemented.3, using filtering chip OPA227, compared to others
Chip has better performance, and it is improper and cause that noise is big, drift to overcome the previous gain bandwidth product selection due to chip
Serious problem is moved, simultaneously because there is the chip low noise, wide bandwidth, high-precision characteristic can greatly improve signal
Acquisition precision.4, data are handled using single-chip microcontroller, the complexity of whole system can be simplified, in combination with single-chip microcontroller
Internal smothing filtering algorithm, can be further improved the precision of signal, improves the stability of whole system.5, the utility model
The clutter ingredient being mixed in signal is reduced, by using the mode that analog filtering is combined with digital filtering so as to improve signal
Precision；Chip OPA548 and the high-precision of OPA227, OPA228, INA217, low noise, low distortion, drift are utilized simultaneously
The characteristics such as small further increase the accuracy of signal acquisition.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model；
Fig. 2 is the circuit diagram of the power amplification unit of the utility model；
Fig. 3 is the circuit diagram of the differential amplification unit of the utility model；
Fig. 4 is the circuit diagram of the low-pass filter unit of the utility model；
Fig. 5 is the circuit diagram of the high pass filter unit of the utility model；
Fig. 6 is the circuit diagram of the postposition amplifying unit of the utility model；
Fig. 7 is the circuit diagram of the emitter following unit of the utility model.
Specific embodiment
The technical solution of the utility model is further described with reference to the accompanying drawings and examples.
As shown in Figure 1, the device includes power amplification circuit, current sensor module, differential amplifier circuit, bandpass filtering
Circuit, post amplifier circuit, emitter follower circuit and signal acquisition circuit.External cycles signal is as the defeated of whole system
Enter signal, which induces electricity through current sensor module by entering current sensor module after power amplification circuit
Stream signal enters differential amplifier circuit, is amplified accordingly in differential amplifier circuit and is filtered out and enters after partial noise
Bandwidth-limited circuit judges the amplitude of signal after filtering out corresponding spectrum component, enters postposition when amplitude is lesser
Amplifying circuit carry out it is certain be amplified into emitter follower circuit, single-chip microcontroller is entered after follower isolation effect and is carried out
Measurement.
As shown in Fig. 2, signal ingoing power amplifying circuit, amplification factor is one times, that is, the voltage amplitude inputted with it is defeated
Voltage amplitude out is equal, and output signal is without obvious distortion.In the amplifying circuit, the one end resistance R11 and resistance R12 phase
Even, other end is connected with the VIN+ pin of chip OPA548；The one end resistance R12 is connected with resistance R11, other end and chip
The end input terminal IN of OPA548 is connected；The one end resistance R13 is connected to the ground, the VIN- pin phase of other end and chip OPA548
Even；The one end resistance R13 ' is connected with the pin Ilim of chip OPA548, other end and capacitor C110, capacitor C130 and row
Needle P11 is connected；The one end feedback resistance Rf is connected with the VIN- of resistance R13 and chip OPA548, other end and chip
The end VO of the VOUT and chip OPA548 of OPA548 are connected；Capacitor C110, the one end capacitor C130 and chip OPA548 Ilim
Pin is connected, and other end is connected to the ground；Capacitor C12, the V+ pin of the one end capacitor C131 and chip OPA548 and row's needle P11 phase
Even, other end is connected to the ground.
As shown in figure 3, there is biggish noise due to incuding obtained current signal, and jamproof ability is poor, together
When circuit with have certain drift, it is therefore desirable to design circuit make its meet have high input impedance, high cmrr,
Low noise, low drifting and high reliability, high-stability requirement, in the present embodiment, differential amplifier circuit is using TI company
INA217 chip, this chip are widely used in because having the characteristics that low noise, low distortion, wide bandwidth, good amplifying power
In the amplifying circuit of instrument and meter.The VIN- pin and input signal pin P21 phase of the one end resistance R21 and chip I NA217
Even, other end is connected with the VIN+ pin of chip I NA217 and input signal pin P22；The one end resistance R22 and chip
The RG1 pin of INA217 is connected, and other end is connected with the RG2 pin of chip I NA217；Capacitor C221, the one end capacitor C231
It is connected with the V- pin and P23 of chip I NA217, other end is connected to the ground；Capacitor C220, the one end capacitor C230 and chip
The V+ pin and row needle P23 of INA217 is connected, and other end is connected to the ground；The pin REF of chip I NA217 is connected to the ground；Core
The pin VOUT of piece INA217 is connected with output signal pin P24.
Since the frequency of measured signal is in 50Hz~1KHz, it is therefore desirable to filter circuit be added and filter out noise and part height
Frequency ingredient.Butterworth configuration is used in filter circuit, Butterworth filter is special in line style phase, attenuation slope and load
Property three aspects there are balanced characteristics, it is easier to realize；The cutoff frequency of high-pass filter is set as 40Hz, it is contemplated that subsequent
The frequency content of measurement, this system set the cutoff frequency of low-pass filter as 4KHz, thus form bandpass filter, such as Fig. 4
Shown, low-pass filter circuit is mainly by signal input terminal P31, resistance R31, resistance R32, resistance R33, resistance R34, resistance
R35, resistance R36, two OPA227 chips, capacitor C31, capacitor C32, capacitor C33, capacitor C34, capacitor C35, capacitor C36, electricity
Hold C37, capacitor C38, capacitor C332, capacitor C333, capacitor C335, capacitor C337, output signal terminal P32, row needle P34,
The one end middle resistance R31 is connected with input signal terminal P31, and other end is connected with resistance R32, resistance R33 and capacitor C31, electricity
Resistance one end R32 is connected with resistance R31, capacitor C31, resistance R33, and other end is connected with capacitor C32 and resistance R34, resistance R33
One end is connected with resistance R31, resistance R32 and capacitor C31, other end and capacitor C32 and chip OPA227 (1) pin-IN
It is connected；The one end capacitor C32 is connected with resistance R31, resistance R32, resistance R33, and other end is connected to the ground；Capacitor C37, capacitor
The one end C332 is connected with the V+ pin of chip OPA227 (1) and row needle P34, and other end is connected to the ground；Resistance R34 one end with
Resistance R32, capacitor C32 and chip OPA227 (1) pin output are connected, other end and capacitor C34, resistance R35, resistance
R36 is connected；The one end capacitor C34 is connected with resistance R34, resistance R35 and resistance R36, and other end is connected to the ground；Resistance R35 mono-
End is connected with capacitor C34, resistance R34, resistance R36, other end and capacitor C35 and chip OPA227 (2) pin-IN phase
Even；The one end resistance R36 is connected with capacitor C34, capacitor R34, capacitor R35, other end and capacitor C35, output signal terminal
The output pin of P32 and chip OPA227 (2) are connected；Capacitor C38 and the one end capacitor C333 are drawn with chip OPA227 (2)
Foot V+, row needle P34 are connected, and the other end is connected to the ground；Capacitor C33, the one end capacitor C335 and the V+ of chip OPA227 (1) draw
Foot, row needle P34 are connected, and other end is connected to the ground；Capacitor C36, the one end capacitor C337 and chip OPA227 (2) V+ pin with
And row needle P34 is connected, other end is connected to the ground；The output pin of the one end output signal terminal P32 and chip OPA227 (2)
It is connected, is connected to other end；The one end input signal terminal P31 is connected with resistance R31, and other end is connected to the ground.
As shown in figure 5, high-pass filtering circuit mainly by input signal terminal P41, output signal terminal P43, capacitor C41,
Capacitor C42, capacitor C43, capacitor C49, capacitor C430, capacitor C411, capacitor C434, capacitor C44, capacitor C45, capacitor C46, electricity
Hold C48, capacitor C431, capacitor C47, capacitor C435, resistance R41, resistance R42, resistance R43, resistance R44, chip OPA227
(3), OPA227 (4), row needle P44, wherein the one end input signal terminal P41 is connected to the ground, and other end is connected with capacitor C41；
The one end capacitor C41 is connected with input signal terminal P41, and other end is connected with resistance R41, capacitor C42, capacitor C43；Resistance
The one end R41 capacitor C41, capacitor C42, capacitor C43 are connected, and other end is connected to the ground；The one end capacitor C42 and capacitor C41, capacitor
C43, resistance R41 are connected, and other end is connected with+IN the pin of chip OPA227 (3) and resistance R42；The one end capacitor C43
It is connected with capacitor C41, capacitor C42, resistance R41, the output pin of other end and resistance R42 and chip OPA227 (3)
It is connected；The one end resistance R42 is connected with+IN the pin of capacitor C42 and chip OPA227 (3), other end and capacitor C43 and
The output pin of chip OPA227 (3) is connected；Capacitor C49, the V+ of the one end capacitor C430 and chip OPA227 (3) and row's needle
P44, capacitor C48, capacitor C431 pin are connected, and other end is connected to the ground；+ IN the pin of chip OPA227 (3) is grounded；Capacitor
The one end C44 is connected with the output pin of chip OPA227 (3) and resistance R42, capacitor C43, other end and resistance R43,
Capacitor C45, capacitor C46 are connected；The one end resistance R43 is connected with capacitor C44, capacitor C45, capacitor C46, other end and ground phase
Even；The one end capacitor C45 is connected with resistance R43, capacitor C44, capacitor C46 ,-IN the pin of other end and chip OPA227 (4)
And resistance R44 is connected；The one end capacitor C46 is connected with resistance R43, capacitor C44, capacitor C45, other end and resistance R44 phase
Even；The one end resistance R44 is connected with-IN the pin of capacitor C45, capacitor C46 and chip OPA227 (4), other end and chip
The output pin and output signal terminal P43 of OPA227 (4) is connected；Chip OPA227 (4)+IN pin ground connection；Output letter
Number 43 one end of terminals P is connected with the output of resistance R44 and chip OPA227 (4), and other end is connected to the ground；Capacitor C49,
The V- pin and row needle P44, capacitor C48, capacitor C431, chip OPA227 (4) of the one end capacitor C430 and chip OPA227 (3)
V- pin be connected, other end is connected to the ground；Capacitor C48, the one end capacitor C431 and capacitor C49, capacitor C430, chip
The V- pin of OPA227 (3) and the V- pin of row needle P44, chip OPA227 (4) are connected, and other end is connected to the ground；Capacitor
C434, the V+ pin of the one end capacitor C411 and chip OPA227 (3), capacitor C435, capacitor C47, row needle P44 and chip
The V+ pin of OPA227 (4) is connected, and is connected to other end；Capacitor C47, the one end capacitor C435 and capacitor C411, capacitor C434,
The V+ pin of chip OPA227 (3), the V+ pin of chip OPA227 (4), row needle P44 are connected, and other end is connected to the ground.
In postposition amplifying circuit as shown in Fig. 6, there is part amplitude smaller due to incuding obtained signal, single-chip microcontroller
It can not accurately measure, it is therefore desirable to amplify the range that single-chip microcontroller can be measured accurately, the one end input terminal P51 and resistance
R51, resistance R52 are connected, and other end is connected to the ground；The one end resistance R51 is connected with input terminal P51 and resistance R52, in addition
One end is connected to the ground；The one end resistance R52 is connected with resistance R51 and input terminal P51, other end and chip OPA228-
IN pin and resistance R53 are connected；+ IN the pin of chip OPA228 is grounded；The one end resistance R53 and resistance R52 and chip
- IN the pin of OPA228 is connected, and other end is connected with the output pin of chip OPA228 and resistance R54；Resistance R54
One end is connected with the output pin of resistance R53 and chip OPA228, and other end is connected with output terminal P52；Output end
Sub- one end P52 is connected with resistance R54, and other end is connected to the ground；Capacitor C51, the one end capacitor C52 and chip OPA228 V-
Pin and row needle P53 are connected, and other end is connected to the ground；Capacitor C53, the one end capacitor C54 and chip OPA228 pin V+
And row needle P53 is connected, other end is connected to the ground.
Emitter follower circuit as shown in Fig. 7, since the signal of output will be acquired into single-chip microcontroller, and single-chip microcontroller
I/O mouth be that there is certain voltage, it is therefore desirable to emitter follower is added influence of the single-chip microcontroller to signal is isolated, simultaneously
Input impedance infinity, the output impedance zero of emitter follower, therefore the output that signal lossless can be lost.Wherein input terminal
Sub- one end P61 is connected with+IN the pin of resistance R61 and chip OPA228, and the other end is connected to the ground；The one end resistance R61 with it is defeated
+ IN the pin for entering terminals P 61 and chip OPA228 is connected, and other end is connected to the ground；- IN the pin of chip OPA228 with
The output pin and resistance R64 of chip OPA228 is connected；- the IN and output of the one end resistance R64 and chip OPA228
The connected other end of pin is connected with output terminal P62；The one end output terminal P62 is connected with resistance R64, other end and ground phase
Even；Capacitor C61, the one end capacitor C62 are connected with the V+ pin of chip OPA228 and row needle P63, and other end is connected to the ground；Electricity
Appearance C63, the one end capacitor C64 are connected with the V+ pin of chip OPA228 and row needle P63, and other end is connected to the ground.
Use the detection and acquisition of above-mentioned signal, including the following contents:
1, it samples: using AD in single chip microcomputer to sample signal with 2.5KHz, adopt 4096 sampling points altogether.
2, it converts: after sampling, FFT transform being done to sampled signal, obtains its spectrogram.
3, it exports: finding amplitude maximal point in frequency spectrum data, corresponding is exactly corresponding frequency component amplitude, amplitude
After value square, amplitude spectrum is just obtained, while obtaining its frequency and exporting simultaneously.
The relationship of 1 electric current of table/frequency measurement and input signal
As shown above, input signal of the external cycles signal as whole system, the signal pass through power amplification circuit
Current signal is induced by over-current sensor and enters differential amplifier circuit, and one times of difference is passed through in differential amplifier circuit
Be amplified into bandwidth-limited circuit, filtered out the signal after higher hamonic wave and clutter and noise enter amplifier circuit into
The amplification that one times of row enters emitter follower through one times of amplified signal, export and input in emitter follower output end etc.
The signal of the frequencies such as width, the signal enter acquisition and display of the Acquisition Circuit realization to signal.
Claims (8)
1. a kind of current signal detecting device, it is characterised in that: put including power amplification circuit, current sensor module, difference
Big circuit, bandwidth-limited circuit, post amplifier circuit, emitter follower circuit and signal acquisition circuit；External cycles signal
As the input signal of whole system, which is passed by entering current sensor module after power amplification circuit through electric current
Sensor module induces current signal and enters differential amplifier circuit, is amplified and is filtered out accordingly in differential amplifier circuit
Enter bandwidth-limited circuit after partial noise, the amplitude of signal is judged after filtering out corresponding spectrum component, to single-chip microcontroller
The amplitude for the signal that can not accurately measure enters emitter follower circuit after amplifying, through entering after follower isolation effect
Single-chip microcontroller measures.
2. current signal detecting device according to claim 1, it is characterised in that: the power amplification circuit uses
OPA548 chip further includes resistance R11, resistance R12, resistance R13 ', feedback resistance Rf, resistance R13, capacitor C12, capacitor
C110, capacitor C130, capacitor C131 and row needle P11, signal input part IN, signal output end VOUT；The power amplification electricity
The amplification factor on road is one times；The one end the resistance R11 is connected with resistance R12, and other end and the VIN+ of chip OPA548 draw
Foot is connected；The one end resistance R12 is connected with resistance R11, and other end is connected with the end input terminal IN of chip OPA548；Resistance R13
One end is connected to the ground, and other end is connected with the VIN- pin of chip OPA548；Draw with chip OPA548's the one end resistance R13 '
Foot IlimIt is connected, other end is connected with capacitor C110, capacitor C130 and row needle P11；Feedback resistance RfOne end and resistance R13
And the VIN- of chip OPA548 is connected, other end is connected with the end VO of the VOUT of chip OPA548 and chip OPA548；
Capacitor C110, one end of capacitor C130 and the I of chip OPA548limPin is connected, and is in addition connected to the ground for one section；Capacitor C12, electricity
Hold the one end C131 to be connected with the V+ pin of chip OPA548 and row needle P11, other end is connected to the ground.
3. current signal detecting device according to claim 1, it is characterised in that: the current sensor module is by painting
Envelope curve coiling on manganese core magnet ring is made.
4. current signal detecting device according to claim 1, it is characterised in that: the differential amplifier circuit uses
INA217 chip further includes chip input signal pin P21, input signal pin P22, row needle P23, output signal pin P24
And capacitor C220, capacitor C221, capacitor C230, capacitor C231, resistance R21, resistance R22；The wherein one end resistance R21 and chip
The VIN- pin and input signal pin P21 of INA217 are connected, the VIN+ pin of other end and chip I NA217 and defeated
Enter signal pins P22 to be connected；The one end resistance R22 is connected with the RG1 pin of chip I NA217, and other end is with chip I NA217's
RG2 pin is connected；Capacitor C221, the one end capacitor C231 are connected with the V- pin and P23 of chip I NA217, other end and ground
It is connected；Capacitor C220, the one end capacitor C230 are connected with the V+ pin of chip I NA217 and row needle P23, other end and ground phase
Even；The pin REF of chip I NA217 is connected to the ground, and pin VOUT is connected with output signal pin P24.
5. current signal detecting device according to claim 1, it is characterised in that: the bandwidth-limited circuit uses Bart
Butterworth configuration；The cutoff frequency of its high-pass filtering circuit is set as 40Hz, sets the cutoff frequency of low-pass filter circuit as 4KHz,
Thus bandpass filter is formed.
6. current signal detecting device according to claim 5, it is characterised in that: the low-pass filter circuit includes signal
Input terminal P31, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, resistance R36, capacitor C31, capacitor C32,
Capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37, capacitor C38, capacitor C332, capacitor C333, capacitor C335, electricity
Hold C337, output signal terminal P32, row needle P34 and two OPA227 chips: the first OPA227 chip and the 2nd OPA227 core
Piece, wherein the one end resistance R31 is connected with input signal terminal P31, other end and resistance R32, resistance R33 and capacitor C31 phase
Even, the one end resistance R32 is connected with resistance R31, capacitor C31, resistance R33, and other end is connected with capacitor C32 and resistance R34, electricity
Resistance one end R33 is connected with resistance R31, resistance R32 and capacitor C31, and other end is drawn with capacitor C32 and the first OPA227 chip
Foot-IN is connected；The one end capacitor C32 is connected with resistance R31, resistance R32, resistance R333, and other end is connected to the ground；Capacitor C37,
The one end capacitor C332 is connected with the V+ pin of the first OPA227 chip and row needle P34, and other end is connected to the ground；Resistance R34
One end is connected with resistance R32, capacitor C32 and the first OPA227 chip pin output, other end and capacitor C34, resistance
R35, resistance R36 are connected；The one end capacitor C34 is connected with resistance R34, resistance R35 and resistance R36, and other end is connected to the ground；Electricity
Resistance one end R35 is connected with capacitor C34, resistance R34, resistance R36, and other end is drawn with capacitor C35 and the 2nd OPA227 chip
Foot-IN is connected；The one end resistance R36 is connected with capacitor C34, capacitor R34, capacitor R35, other end and capacitor C35, output signal
The output pin of terminals P 32 and the 2nd OPA227 chip is connected；Capacitor C38 and the one end capacitor C333 and the 2nd OPA227 core
Piece pin V+, row needle P34 are connected, and the other end is connected to the ground；Capacitor C33, the one end capacitor C335 and the first OPA227 chip V+
Pin, row needle P34 are connected, and other end is connected to the ground；Capacitor C36, the one end capacitor C337 and the V+ of the 2nd OPA227 chip draw
Foot and row needle P34 are connected, and other end is connected to the ground；The one end output signal terminal P32 and the 2nd OPA227 chip
Output pin is connected, and is connected to other end；The one end input signal terminal P31 is connected with resistance R31, other end and ground phase
Even；
The high-pass filtering circuit includes input signal terminal P41, output signal terminal P43, capacitor C41, capacitor C42, capacitor
C43, capacitor C49, capacitor C430, capacitor C411, capacitor C434, capacitor C44, capacitor C45, capacitor C46, capacitor C48, capacitor
C431, capacitor C47, capacitor C435, resistance R41, resistance R42, resistance R43, resistance R44, row needle P44 and two OPA227 cores
Piece: the 3rd OPA227 chip and the 4th OPA227 chip, wherein the one end input signal terminal P41 is connected to the ground, other end with
Capacitor C41 is connected；The one end capacitor C41 is connected with input signal terminal P41, other end and resistance R41, capacitor C42, capacitor
C43 is connected；The one end resistance R41 capacitor C41, capacitor C42, capacitor C43 are connected, and other end is connected to the ground；The one end capacitor C42 with
Capacitor C41, capacitor C43, resistance R41 are connected, and other end is connected with+IN the pin of the 3rd OPA227 chip and resistance R42；
The one end capacitor C43 is connected with capacitor C441, capacitor C2, resistance R41, other end and resistance R42 and the 3rd OPA227 chip
Output pin be connected；The one end resistance R42 is connected with+IN the pin of capacitor C42 and the 3rd OPA227 chip, other end
It is connected with the output pin of capacitor C43 and the 3rd OPA227 chip；Capacitor C49, the one end capacitor C430 and the 3rd OPA227
The V+ and row needle P44, capacitor C48, capacitor C431 pin of chip are connected, and other end is connected to the ground；3rd OPA227 chip
+ IN pin ground connection；The one end capacitor C44 is connected with the output pin of the 3rd OPA227 chip and resistance R42, capacitor C43,
Other end is connected with resistance R43, capacitor C45, capacitor C46；The one end resistance R43 and capacitor C44, capacitor C45, capacitor C46 phase
Even, other end is connected to the ground；The one end capacitor C45 is connected with resistance R43, capacitor C44, capacitor C46, other end and the 4th
- IN the pin and resistance R44 of OPA227 chip are connected；The one end capacitor C46 is connected with resistance R43, capacitor C44, capacitor C445,
Other end is connected with resistance R4；- IN the pin of the one end resistance R44 and capacitor C45, capacitor C46 and the 4th OPA227 chip
It is connected, other end is connected with the output pin of the 4th OPA227 chip and output signal terminal P43；4th OPA227 core
Piece+IN pin ground connection；The one end output signal terminal P43 is connected with the output of resistance R44 and the 4th OPA227 chip, in addition
One end is connected to the ground；Capacitor C49, the V- pin of the one end capacitor C430 and the 3rd OPA227 chip and row needle P44, capacitor C48,
Capacitor C431, the V- pin of the 4th OPA227 chip are connected, and other end is connected to the ground；Capacitor C48, the one end capacitor C431 and electricity
The V- pin for holding C49, capacitor C430, the V- pin of the 3rd OPA227 chip and row needle P44, the 4th OPA227 chip is connected,
Other end is connected to the ground；Capacitor C434, the one end capacitor C411 and the 3rd OPA227 chip V+ pin, capacitor C435, capacitor
The V+ pin of C47, row needle P44 and the 4th OPA227 chip are connected, and are connected to other end；Capacitor C47, the one end capacitor C435
With capacitor C411, capacitor C434, the V+ pin of the 3rd OPA227 chip, the V+ pin of the 4th OPA227 chip, row's needle P44 phase
Even, other end is connected to the ground.
7. current signal detecting device according to claim 1, it is characterised in that: the post amplifier circuit includes defeated
Enter terminals P 51, output terminal P52, resistance R51, resistance R52, resistance R53, resistance R54, capacitor C51, capacitor C52, capacitor
C53, capacitor C54, row needle P53, the first OPA228 chip, wherein the one end input terminal P51 is connected with resistance R51, resistance R52,
Other end is connected to the ground；The one end resistance R51 is connected with input terminal P51 and resistance R52, and other end is connected to the ground；Electricity
Resistance one end R52 is connected with resistance R51 and input terminal P51 ,-IN the pin and electricity of other end and the first OPA228 chip
R53 is hindered to be connected；+ IN the pin of first OPA228 chip is grounded；The one end resistance R53 and resistance R52 and the first OPA228 chip
- IN pin be connected, other end is connected with the output pin of the first OPA228 chip and resistance R54；The one end resistance R54
It is connected with the output pin of resistance R53 and the first OPA228 chip, other end is connected with output terminal P52；Output end
Sub- one end P552 is connected with resistance R54, and other end is connected to the ground；Capacitor C51, the one end capacitor C52 and the first OPA228 chip
V- pin and row needle P53 be connected, other end is connected to the ground；Capacitor C53, the one end capacitor C54 and the first chip OPA228
Pin V+ and row needle P53 be connected, other end is connected to the ground.
8. current signal detecting device according to claim 1, it is characterised in that: the emitter follower circuit includes defeated
Enter terminals P 61, output terminal P62, row needle P63, resistance R61, resistance R64, capacitor C61, capacitor C62, capacitor C63, capacitor
C64, the 2nd OPA228 chip；Wherein+IN pin the phase of the one end input terminal P61 and resistance R61 and the 2nd OPA228 chip
Even, the other end is connected to the ground；The one end resistance R61 is connected with+IN the pin of input terminal P61 and the 2nd OPA228 chip, separately
Outer one end is connected to the ground；- IN the pin of 2nd OPA228 chip and the output pin and resistance of the 2nd OPA228 chip
R664 is connected；The one end resistance R64 is connected other end and output terminal with-IN and the output pin of the 2nd OPA228 chip
P62 is connected；The one end output terminal P62 is connected with resistance R64, and other end is connected to the ground；Capacitor C61, one end capacitor C62 and the
The V+ pin and row needle P63 of two OPA228 chips are connected, and other end is connected to the ground；Capacitor C63, the one end capacitor C64 and core
The V+ pin and row needle P3 of piece OPA228 is connected, and other end is connected to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822029973.4U CN209559967U (en) | 2018-12-04 | 2018-12-04 | A kind of current signal detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822029973.4U CN209559967U (en) | 2018-12-04 | 2018-12-04 | A kind of current signal detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209559967U true CN209559967U (en) | 2019-10-29 |
Family
ID=68302694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822029973.4U Expired - Fee Related CN209559967U (en) | 2018-12-04 | 2018-12-04 | A kind of current signal detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209559967U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884382A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of current signal detecting device based on FPGA |
| CN109884381A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of high speed, high-precision current signal supervisory instrument |
-
2018
- 2018-12-04 CN CN201822029973.4U patent/CN209559967U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884382A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of current signal detecting device based on FPGA |
| CN109884381A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of high speed, high-precision current signal supervisory instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104991115B (en) | A kind of chopped mode direct current detection method and circuit | |
| CN209559967U (en) | A kind of current signal detecting device | |
| CN107450036B (en) | Self-injection locking formula concatenated flux door sensor and implementation | |
| CN205941680U (en) | Luo shi coil current mutual -inductor measuring device based on ancillary coil revises | |
| CN108535539A (en) | A kind of electric energy meter and its AFE(analog front end) meeting IR46 standards | |
| CN203759090U (en) | Current sampling circuit of rail-transit traction data acquisition system | |
| CN106130534A (en) | Digital integrator for direct current long pulse current measurement | |
| CN108872697A (en) | High interference immunity voltage collection circuit and its method for power battery monomer | |
| CN207399155U (en) | Signal filtering process Compare System based on analog-digital converter | |
| CN107296599B (en) | Multi-lead ECG signal conditioning and data acquisition circuit | |
| CN107765085A (en) | A kind of signal supervisory instrument and method | |
| CN205120856U (en) | Power quality monitor device of transformer substation | |
| CN212845568U (en) | Current sampling circuit for remote transmission type fault indicator | |
| CN202748160U (en) | Anti-interference temperature sampling circuit | |
| CN213814361U (en) | High-precision loop resistance tester | |
| CN109884381A (en) | A kind of high speed, high-precision current signal supervisory instrument | |
| CN108037359A (en) | A kind of grid frequency measurement circuit for eliminating flickering and m-Acetyl chlorophosphonazo interference | |
| CN215677333U (en) | High-precision thermocouple temperature acquisition circuit | |
| CN109884382A (en) | A kind of current signal detecting device based on FPGA | |
| CN113746502A (en) | HPLC power line carrier communication channel measuring device | |
| CN208432658U (en) | A kind of electric energy meter and its AFE(analog front end) meeting IR46 standard | |
| CN207689561U (en) | It is a kind of based on amplifier can bias-adjusted WeChat ID Acquisition Circuit | |
| CN112526437A (en) | Real-time acquisition system for running state of high-voltage transformer group | |
| CN216016860U (en) | HPLC power line carrier communication channel measuring device | |
| CN213986674U (en) | Transformer characteristic and capacity tester capable of improving working efficiency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: NANJING ORIENT INFORMATION TECHNOLOGY Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2020980007078 Denomination of utility model: A current signal detection device Granted publication date: 20191029 License type: Common License Record date: 20201026 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210419 Address after: No. 2002, Zhongshan East Road, Qinhuai District, Nanjing, Jiangsu 210000 Patentee after: Nanjing Wanxin Donglian Intelligent Technology Co.,Ltd. Address before: 210023, No. 66, new exemplary Road, Nanjing, Jiangsu Patentee before: NANJING University OF POSTS AND TELECOMMUNICATIONS |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191029 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |